Hone



M h 22, was,

HONE

-RiletLSept. 14, 1936 w. B. SCHMIDT 2,112,120-

Patented Mar. 22, 1938 PATENT OFFICE noun William D. Schmidt, Worcester, Mass.I assignor to The Heald Machine Company, Worcester, Mass a corporation of Massachusetts Application Septemhcr'M, 1936, Serial No. 100,579 9 Claims. (of. 51 1843 The present invention relates to a hone especially adapted for theflnishing of external or intemal surfaces as, for example, the raceways of roller bearings, and the'invention is particularly directed. to an arrangement by which the individual honing stones or other honing members may all be held in contact with the work at all times.

In a copending application filed by Harold L.

Blood, Serial No. 100,580, filed September 14, 1936 fora Hone, there is discloseda resilient arrangement by which the several honing stones making up the complete hone are individually resiliently held against the workpiece, thereby compensating for uneven wear on theseveral stones. In this structure, the resilient arrangement above referred to is in addition to a resilient actuating mechanism by which the several honing members structure by which each of the honing members may be independently held resiliently against the surface being honed, at the same time avoiding the necessity for the diaphragm of the Blood construction, Other'and further objects and advantages of the invention will hereinafter more fully appear from the following detailed description, taken in connection with the accompanying drawing, in which-.-

Fig. 1 is a side elevation; partly in section, of a 5 hone embodying the-invention.

' Fig. 2 is an end elevation of the hone of Fig. 1,

also partly in section.

Fig. 3"is a perspective "view of one of the elements of the hone. v

Fig. 4 is a side elevation .of the hone head. Like reference characters refer to like parts in thedifierent figures.

With reference to Fig. 1, the hone comprises ahead or arbor I, having an axial bore 2 in which a spindle 3 isslidable. The head has a key 4 engaging with a keyway 5 in the spindle to hold the latter against rotation and to allow for axial movement of the spindle. The spindle 3 has an arcuate'shoulder 6 positioned within the head, and the end of the spindle projects beyond'the head and has a cap 1 secured thereto. Theop'posite end of the spindle receives an axially positioned bolt 8 for controlling the effective length of the spindle,the bolt being held against turnin: movement by a locking nut 9. A cylindrical scribed.

The head I has a plurality of radially extending slots l2, in each of which is positioned a lever l3, see also Fig. 3, substantially of bell crank form. One arm of the lever 13 has extending parallel thereto a bar I which is integral with the lever and which has a substantial amount of resiliency. At the end of the bar is an arcuate protuberance J5 engageable with the arcuate shoulder 6 on the hone spindle 3, thus permitting oscillation of the lever I 3. about this point. It will be noted that the arcuate protuberance I5 is not permanently attached to the honing spindle 3, but

merely rests thereagainst and may be withdrawn from engagement therewith at any time.

Surrounding, the head I, adjacent the bases of the slots I2, is anannular member I6 secured" to the head as by bolts l1, said annular member. having an inwardly extending flange l8 spaced from the base of the slots l2 a suflicient distance to allowthe end of each bell crank lever 13, with which the .bar It is integral, tobe located between said flange and the base of the slot. This end of the lever has a surface l9 engageable with the inner side of the flange l8, so that each of thelevers l3 can rock about the point of engagement between the lever and the flange. It will be noted that each bell crank lever I3 is free from positive". attachment to the inwardly extending flange l8,

flange l8 and may be removed therefrom at any time. 3 v

The opposite-end of the'lever i3 is tapered,

' with the inner surface thereof extending sub- I stantially .parallel to and spaced from the projecting end of the spindle 3. On the outer surface of the lever at this end is an arcuate lug 20 which engages in an arcuate recess 2| in a hone the hone carrier 22 to the end of the bell crank lever i3, and this connection is accordingly a free pivotal connection making possible the separation of the hone carrier from the lever at any sive material. The stone is additionally held in place by flanges extending upwardly from the holder. The latter preferably has lugs 26 engaging in recesses 21 in the carrier to prevent the holder from moving on the carrier when the hone is in operation.

The holders are held-on the carriers by coil springs 28 and 29, each arranged in the form of an annulus. The spring 28 is positioned at the inner or right hand (Fig.1) end of the holders and engages the flanges 25. The other 2011 spring 29 is positioned in a recess 30 in the outer end of each 'of the holders, and the inturned portion of the holder which forms this recess engages in a correspondingly shaped recess 3| in the carrier. Not only do these coil springs hold the holders against the carriers, but they also hold each carrier in engagement with the corresponding lever and hold the levers against the shoulder 6 of the hone spindle 3. For additionally holding the levers l3 in predetermined relation to each other in the head, a coil spring 32 is provided, also in the form of an annulus, and this coil spring is positioned in a slot 33 in the head, with the spring engaging all of the levers, each of which has a slot 34 to receive said spring.

The honing head above described is applicable to any suitable type of support in which is incorporated a structure for expanding and contracting the hone. .In the construction shown,. the spindle l l, on which the head is mounted, has

an axial bore 35 in which the'inner end of the spindle3 is received. Within the spindle is located an actuating rod 36 having at the end thereof a head 31 engageable with the end of the bolt 8. The rod 36 with the head thereon is re-. siliently urged to the left by a compression coil spring 38 surrounding the rod. The remainder of the hone support is of any suitable character, one example being fully shown and described in a copending application of Harold L. Blood, Serial No. 92,396, filed July 24, 1936, and is not a part of the present invention. It is sufiicient to note that movement of the rod 36 to the left, Fig. 1, is preferably limited to prevent the honing stones from being expanded by the coil spring to such an extent that they cannot enter the bore of the workpiece to be honed. The rod 36 may also have incorporated thereon a suitable mechanism for withdrawing said rod to the right, Fig. 1, to permit collapse of the hone when desired. I

In operation the hone is expanded to such an amount that it can enter the bore of the workpiece and engage therewith, a-workpiece a being shown in operative engagement with the several honing stones. As the workpiece is given an axial reciprocation relative to' the hone during the hohing'operation, the honing stones are urged inwardly as the workpiece moves to the right relative to the hones, and outwardly as the workpiece moves to the left, this movement being permitted by a resilient action of the spring 38, and this in and out movement of the stones causes a slight reciprocatory movement of the rod 36 within the spindle. The spring 38 operates. through the hone spindle 3 to urge all of the levers I3 outwardly to carry the honing stones into engagement with the workpiece, with each of the stones urged with substantially the same pressure as each of the other stones. If any one of the stones becomes reduced in size however, by reason of more rapid wear than takes place on the remaining stones, the pressure exerted by the spring 38 cannot compensate for this uneven wear, but the continue to act upon the workpiece.

From the foregoing, it will be apparent that each of the honing stones is resiliently urged against the workpiece individually, so that variations in the rate ofwear of the several stones will not affect the operation of the hone. This resilient connection in the present structure is integral with the hone carrying lever, by which the stone is urged into engagement with the workpiece. Wh'ere the honing stones or members are normally held resiliently against the workpiece, as by a single resilient mechanism, this individual resilient structure is separate from the main resilient mechanism and operates independently thereof. It will be apparent that the bar I4 has a predetermined position relative to the lever I3, so that when the rod 36 is shifted to the right, Fig. 1, the hone may be collapsed by the pressure exerted onthe hone by the several coil springs 28, 29 and 32.

1. In a honing device, an arbor, a plurality of levers carried thereby, each lever having a free pivotal connection at one point thereof with the arbor, a honing member carried by each lever and mounted for rocking movement relative thereto, each member having a free pivotal connection with the lever, an actuating means for urging all of said levers as a group into operative position, anda resilient connection between said means andeach of said levers for urging each of said levers independently of the other levers into operative position, whereby each honing member is individually held against the workpiece.

2. In a honing device, an arbor, a levercarried thereby, a honing member carried by the lever, means for urging said lever into operative position, said lever having a resilient portion providing a connection between said lever and said means.

3. In a honing device, an arbor, a plurality of levers carried thereby, a honing member carried by each lever, a'n actuating means for urging all of said levers as a group into operative position,

, each of said levers having a resilient portion providing'a. connection between said lever and the actuating means. i

4. In a honing device, an arbor, a bell-crank" lever carried thereby, one end of said lever being engageable with said arbor, a honing member on the opposite end of the lever, and means for urging said lever and member into operative posi tion, said lever having an integral resilient bar engageable with said means.

'5. In a honing device, an arbor, a plurality of bell-crank levers carried by said arbor, one end of each of said levers being engageable with said arbor, a honing member on the opposite end of each lever, and means for urging all of said levers as a group into operative position, each lever having an integral resilient bar engageable with said means.

6. In a honing device, an arbor, a bell-crank lever carried thereby, one end of said lever being engageable with said arbor, a honing member on the opposite end of the lever, and means for urging said lever and member into operative position, said lever having an integral resilient bar with its free end adjacent to the corner of the lever and engageable with said means,

'2. In a honing device, an arbor, a plurality of bell-crank levers carried by said arbor, one end of each of said levers being engageable with said arbor, a honing member on the opposite end of each lever, and means for urging all of said levers as a group into operative position, each lever-having an integral resilient bar, with the free end oi'eachlbar adjacentito the comer of the corresponding lever and engageable with said 'means 8. Ina'honing device, an arbor having a plural-- ity of radial slots therein, a lever positioned in each slot and having a pivotal movement relative to. the arbor, a honing member rockably mounted on each lever, and a plunger within the arbor and engaging with each lever, each lever having an integral resilient bar providing a connection between the lever and the plunger.

' 9. In a honing device, an arbor having a plurality of radial slots therein, a. bell-cranklever positioned in each of said slots with one end of each lever engaging with the arbor for rocking movement relative thereto, a honing member rockably mounted on the opposite end of each lever, a resilient bar integral with each lever and having its free end adjacent the corner thereof, and

a plunger within the arbor and engageable with the free ends of the resilient bar for urging the levers and the honing members carried thereby into operative position.

WILLIAM B. SCHMIDT; 

